[Jewelry making - Article 00227] - Re: [Orchid] Slow drilling using a flex shaft

[James Binnion]

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Ian,

    These speeds are for high speed steel drills not carbide. I drill sub
    millimeter holes regularly at 10,000 rpm using a fairly cheap $200
    drill press purchased from Micro Mark made for tiny drills, certainly
    not the highest quality spindle or bearings but it works. I will not
    say I never break a bit but it is a very very rare occurrence. I hand
    hold the work under the spindle resting on the table. I often am
    going 8 to 10 diameters deep. I also drill freehand with a flexshaft
    and use lower speeds. So while I agree you can cut successfully at
    lower speeds I also know that the drill cuts best when the correct
    SFM is used, when you go slow you are overloading the drills cutting
    edge and more likely to have too large a chip which leads to broken
    bits. At any speed the user needs to have more skill when using small
    bits. 

Jim

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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